1. Matakuliah: S2094 / Rekayasa Pondasi Tahun: 2005 Versi: 1.1 Pertemuan 07 Daya Dukung Pondasi Dangkal

2. Shallow Foundations Shallow Foundations versus Deep FoundationsShallow Foundations versus Deep Foundations

3. Shallow Foundations Usually the more economical optionUsually the more economical option As a general rule, consider deep foundations only when shallow foundations do not give satisfactory designAs a general rule, consider deep foundations only when shallow foundations do not give satisfactory design Types of Shallow foundationsTypes of Shallow foundations Spread footings (square, circular, rectangular)Spread footings (square, circular, rectangular) Combined FootingsCombined Footings Continuous FootingsContinuous Footings Mat or Raft FoundationsMat or Raft Foundations

6. Combined/Strap Footing

7. Construction Methods Excavation; Backhoe followed by handworkExcavation; Backhoe followed by handwork oNeat footing-no formwork used oFormed footing

8. Mat (or Raft) Foundation

9. Computation of Bearing Pressure Bearing Pressure –Gross Bearing Pressure (q) –Net Bearing Pressure(q´) Bearing Capacity –Ultimate Bearing Capacity (q ult ) –Allowable Bearing Capacity (q a)

11. Computation of Bearing Pressure Column Load (Ex 5.1) Wall Load (Ex 5.2)

12. Net Bearing Pressure Net Bearing Pressure (q´) Floating Foundation –When q´ = 0 –Example: Student Center Building at MIT Estimated without floatation settlement = 1.0ft and settlement with partial floatation was 2-3 inches

14. Eccentric Loads or Moments

17. Two-way Eccentric Loads or Moments

18. Eccentric Loads or Moments For contact pressure to remain (+) ve everywhere,